[置顶] CentOS下拨号上网（网络转载）

一、确实pppoe软件包已经安装
rpm -qa|grep rp-pppoe

二、运行 adsl-setup 命令，会出现相关提示，根据提示输入账号，密码，还有DNS服务器地址即可：

[ root@sysconfig ~ ] # adsl-setup
Welcome to the ADSL client setup.  First, I will run some checks on
your system to make sure the PPPoE client is installed properly...


LOGIN NAME

Enter your Login Name (default root): B401    (需要输入的账号，我这里输B401为例)



然后进入下一个提示：

INTERFACE

Enter the Ethernet interface connected to the ADSL modem
For Solaris, this is likely to be something like /dev/hme0.
For Linux, it will be ethX, where 'X' is a number.
(default eth0):                 (需要选择进行拨号的网卡，我这里使用默认的Eth0，按回车即可)    

然后进入下一个提示：


Do you want the link to come up on demand, or stay up continuously?
If you want it to come up on demand, enter the idle time in seconds
after which the link should be dropped.  If you want the link to
stay up permanently, enter 'no' (two letters, lower-case.)
NOTE: Demand-activated links do not interact well with dynamic IP
addresses.  You may have some problems with demand-activated links.
Enter the demand value (default no):        （这一步选择默认的no即可，回车）


然后进入下一个提示：输入第一个DNS服务器地址，


DNS

Please enter the IP address of your ISP's primary DNS server.
If your ISP claims that 'the server will provide dynamic DNS addresses',
enter 'server' (all lower-case) here.
If you just press enter, I will assume you know what you are
doing and not modify your DNS setup.
Enter the DNS information here:  202.96.134.133     （我这里输入的是广州的DNS服务器地址）

然后进入下一个提示：输入第二个DNS服务器地址，

Please enter the IP address of your ISP's secondary DNS server.
If you just press enter, I will assume there is only one DNS server.
Enter the secondary DNS server address here: 8.8.8.8 （我这里输入的是转发DNS服务器地址）

然后进入下一个提示：输入密码，再确认输入一次，


PASSWORD

Please enter your Password:
Please re-enter your Password:

然后进入下一个提示：

USERCTRL

Please enter 'yes' (three letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes):
                        （这一步选择默认的yes即可，回车）

然后进入下一个提示：

FIREWALLING

Please choose the firewall rules to use.  Note that these rules are
very basic.  You are strongly encouraged to use a more sophisticated
firewall setup; however, these will provide basic security.  If you
are running any servers on your machine, you must choose 'NONE' and
set up firewalling yourself.  Otherwise, the firewall rules will deny
access to all standard servers like Web, e-mail, ftp, etc.  If you
are using SSH, the rules will block outgoing SSH connections which
allocate a privileged source port.

The firewall choices are:
0 - NONE: This script will not set any firewall rules.  You are responsible
          for ensuring the security of your machine.  You are STRONGLY
          recommended to use some kind of firewall rules.
1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation
2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway
                for a LAN
Choose a type of firewall (0-2): 0    （这一步选择是否启用防火墙，我这里不使用，输入0）


然后进入下一个提示：
Start this connection at boot time

Do you want to start this connection at boot time?
Please enter no or yes (default no):   （这一步选择是否开机自动启用，我这里不使用，回车即可）


然后进入下一个提示：
** Summary of what you entered **

Ethernet Interface: eth0
User name:          B401
Activate-on-demand: No
Primary DNS:        202.96.134.133
Secondary DNS:      8.8.8.8
Firewalling:        NONE
User Control:       yes
Accept these settings and adjust configuration files (y/n)? y
                （这一步选择是否确认交运行此配置，我这里输入y启用，）

Adjusting /etc/sysconfig/network-scripts/ifcfg-ppp0
Adjusting /etc/resolv.conf
  (But first backing it up to /etc/resolv.conf.bak)
Adjusting /etc/ppp/chap-secrets and /etc/ppp/pap-secrets
  (But first backing it up to /etc/ppp/chap-secrets.bak)
  (But first backing it up to /etc/ppp/pap-secrets.bak)



Congratulations, it should be all set up!

Type '/sbin/ifup ppp0' to bring up your xDSL link and '/sbin/ifdown ppp0'
to bring it down.
Type '/sbin/adsl-status /etc/sysconfig/network-scripts/ifcfg-ppp0'
to see the link status.

到此，已完成设置adsl上网功能。在/etc/sysconfig/network-scripts/这个目录下会生成ifcfg-ppp0的文件。

[ root@sysconfig ~ ] # adsl-status （查看adsl状态）

[ root@sysconfig ~ ] # adsl-stop (关闭adsl连接）

[ root@sysconfig ~ ] # adsl-start （启用adsl连接）

[ root@sysconfig ~ ] # adsl-connect （连接adsl上网）